Equalizing pump-jack.



I. B. DUNLAP.

EOUALIZING PUMPlAICK. v APPLICATION FILED .'uLY 6.I9II.

152721,86 1,. PatenIedAug. 6,1918.

2 SHEETS-SHEET 2.

Umano sanftes' raras onirica :rosnrn is.V DUNLAP, or TULSA', OKLAHOMA.

EQUAL'IZING PUMP-JACK.

To all whom t may concern:

Be it known that I, JOSEPH B. DUNLAP, a

citizen of the United States, and a residentA of Tulsa,in thewcounty ofTulsa and State of Oklahoma, ful Improvements Jacks, of which th tion.-L' c y My invention is an'- improvement vin equalizing pump jacks,andAhas for rits'ob have invented new andusein Equalizing Pump following isa specificaject to provlde a jack 'wherein' the frame attaches to thecasing for holding `the jack' in alinementwith thepump rod to cause thepull to be in direct alinement with thestuing boxto minimize the wear onthe rod and box, and wherein a drum isprovided Jfor permittingadjustment ot thestr'oke by engaging the line with different parts 'ofthe drum. p

In the drawings:

Figure 1 is a Side View of the imprveae jack;

Fig. 2 is a front view;

Fig. 3 is a front view of the equalizing drum;

Fig. 4 is a perspective view of the vibrat-'I inlever;

ig. 5 is a similar view of one of the bearings for the sheave wheel;

Fig. 6 is a perspective view of the casing clamp.

In the present embodiment of the invention, a suitable base 1 isprovided, and at one end of the said base there is a pair of standards 2which carries the sheave wheel 3, the said standards being of angularmaterial, as shown, and arranged with one side of their angular portionsparallel and with the other extending outwardly and in the same plane.

A bearing block 1 is provided for mounting the sheave wheel, the saidblock having at one end an overlying web 5, which is adapted to engageover the top of the adjacent standard, and this web is notched, asindicated at 6, to receive the outwardly extending portion of thestandard. At the notch the web extends beyond the adjacent side of theblock, as shown, and the block is provided with an opening for receivinga reduced journal pin 7 on the end of the shaft 8 of the sheave wheel,and with smaller openings for receiving bolts 9 which connect the blockto the standard.

The rope or cable 10 which connects the pump rod 11 with the vibratinglever 12 Speccation of Letters Patent. y.

passes over the sheavewheel and about the compensating drum 13. At oneend' the cable is passed through an eye in the' plunger stem, and at theother end through a loop la on vthe lever "It will be noticed thatthislever has notches 15 in its opposite edges for engagement by the loop 14and ,by a loop 16 which connects the lever to a suitable source of powerfor vibrating-the lever.

The casing 17 for flrmly 'lock the pump 'jack to the casing. Thisybearing, as shown, consists of sectionslS, fe'achof which is recessedVon'its inner face, as indicated at 19, for receiving the lppumpc`asing,fan'd Athefsections are connected' together by vbolts l and nuts20. The standards are spaced apartnear their upper ends by an arbor 21which encircles a bolt 22 connecting the' standards, and the standardslare braced by inclined braces 23, between which is mounted thecompensating reel 13. The braces 23 are angle bars, and on their outerfaces are bearing blocks 241 for the shaft 25 of the reel. These blocks,as shown in Figs. 1 and 3, have a central opening for receiving the endsof the shaft 25, and they are bolted to the vertical portion oi' theangle braces on the outer sides of the said braces, as shown in Fig. 1.

The reel, shown more particularly in Fig. 3, has a double taperconsisting of two frusto-co'nical portions small ends adjacent, andtheentire reel has a spiral groove 26 which is continuous from one end ofthe reel to the other. The stroke of the pump, it will be evident, willdepend upon the position of the cable 10 with respect to the reel. Oneend of the shaft 25 is polygonal, as shown at 30, for receiving a wrenchin order that the shaft may be turned to bring the cable to a differentportion of the drum, and the cable may be moved from place to place,that is, from the lowest to the highest or in the opposite direction,for the purpose of adjustment. The spiral groove will cause the cable tofollow the groove in whichever direction the drum is turned.

Through the clamp 18, the sheave wheel is held in exact position withrespect to the pump cylinder, so that the cable passes tangentially overthe reel directly to the pump plunger.

I claim:

1. A pump jack comprising a frame havj Patented Aug. c, 191s.,Application 1edJu1ye,1917. seiaiNqriaosl. Y

p the well is engaged 'by' the sectionatbearmg shown lin Fig. 6 tosimilar arranged with their y ing means at one end for clamping theframe to the Well casing and having a pair of standards at the said end,a sheave wheel journaled between the standards, a Cable passing over thesheave Wheel and connected to the plunger rod of the leverpivote'd tothe frame at the opposite end from the standards, the other end of thecable being adjustably connected to the said lever and a compensatingdrum journaled adjacent the standards and about Which the cable passesbetween the sheave Wheel and the lever, said drum being of smallestdiameter at its center and gradually increasing in diameter toward itsends and havinO' a siral Oroove runnin from one end tothe other, saiddrum having an eX- tended journal pin, polygonal for engagement by aWrench.

2. A pump jack comprising a frame having means at one end for clampingthe frame to the Well casing and having a pair of standards at the saidend, a sheave Wheel j ournaled between the standards, a cable passingover the sheave Wheel and connected to the plunger rod of the pump, anoperating i level` pivotedl to vthe frame at the opposite Copies of thispatent may be obtained for five cents each, by addressing theCommissioner of `Patente. I

pump, an operating` o end from the standards, the otherend of the cablebeing adjustably connected to the said lever, and a compensating drumjournaled adjacent the standards and about which the cable passesbetween the sheave Wheel and the lever, said drum being of smallestdiameter at its center and gradually increasing in diameter toward itsends and having a spiral groove running from one end to the other.

3. A pump jack comprising` a` frame, a Sheave Wheel journaled on theframe,- a cable passing over the sheave Wheel and adapted for connectionat one end to the plunger rod of the pump, the frame at Vthe oppositeend from the sheave Wheel, the other end of `the cable being' adjustablyconnected to the lever, and a compensating drum journaled adjacent tothe sheave Wheel passes between the sheave Wheel and the lever, saiddrum having a spiral groove running from one end to the other and beingof largest diameter toward its ends. .c i.

JOSEPH B. DNLAP.' Titiiesses PETER DEICHMAN, B. E; BELL.`

Washington, D. C.

an operating lever pivoted to and about .Which `the cable

